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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 18, Iss. S2 — Jun. 21, 2010
  • pp: A231–A236

Novel yellowish-orange Sr8Al12O24S2:Eu2+ phosphor for application in blue light-emitting diode based white LED

Te-Wen Kuo, Chien-Hao Huang, and Teng-Ming Chen  »View Author Affiliations


Optics Express, Vol. 18, Issue S2, pp. A231-A236 (2010)
http://dx.doi.org/10.1364/OE.18.00A231


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Abstract

A new yellowish-orange phosphor, Sr8Al12O24S2:Eu2+, was synthesized by the solid-state method and its photoluminescence properties were investigated by excitation and emission spectra. Its excitation band is extending from 400−500 nm, which is adaptable to the emission band of blue LED chips (450−470 nm). Upon the excitation of 450 nm light, the phosphor exhibits strong yellowish-orange emission centered at 605 nm with good thermal stability. A white light-emitting diode (W-LED) that consists of a blue LED chip (~470 nm) and a (Sr0.92Eu0.08)8Al12O24S2 phosphor is demonstrated. The CIE1931 chromaticity coordinates (x, y) are (0.34, 0.25), the correlated color temperature (CCT) is 4300 K, and the luminous efficacy of this W-LED is 14.2 lm/W at room temperature and with a forward-bias current of 400 mA.

© 2010 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(250.5230) Optoelectronics : Photoluminescence

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: April 8, 2010
Revised Manuscript: June 2, 2010
Manuscript Accepted: June 4, 2010
Published: June 10, 2010

Citation
Te-Wen Kuo, Chien-Hao Huang, and Teng-Ming Chen, "Novel yellowish-orange Sr8Al12O24S2:Eu2+ phosphor for application in blue light-emitting diode based white LED," Opt. Express 18, A231-A236 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-S2-A231


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